Process for electroplating with zinc.



AUGUSTE ABSENE LEMETRE, 0F PARIS, FRANCE.

PROCESS FOR ELECTROPLATING WITH ZINC.

No Drawing.

Specification of Letters Patent.

Patented Dec. 26, 1911.

Application filed May 29, 1911. Serial No. 630,158.

To all whom it may concern:

Be it known that I, AUoUs'rE ARsiaNE LEMfiTRE, a citizen of the Republic of France, residing at Paris, France, have invented certain new and useful Improvements in Processes for Electroplating with Zinc, of which the following is a specification.

This invention has for its object to provide a process for electroplating metals and mechanical parts of iron, steel and the like with zinc in order to preserve them from rust.

The invention is characterized by the employment of a cold bath of a special definite composition the object of which is to deposite galvanically upon the said metal parts an adherent and penetrating layer of metallic zinc. This bath comprises the chemical compounds set forth below in the following proportions: sulfate of. zinc 12 kilos, ammonium chlorid 3 kilos, sulfate of soda 2 kilos, sulfuric acid 1 kilo, water 100 liters. It should be employed in a cold state, that is to say it should not be maintained at a temperature exceeding 30 degrees centigrade approximately.

Various chemical compounds differing from those enumerated above might also be employed provided that they are capable of forming by their union or their combination, or by their dissociation, in the midst of the liquid constituting the bath itself, ammonium chlorid, sulfuric acid and sulfate of soda. With this object it is possible to employ bisulfate of soda, for example, seeing that it is capable of replacing, either entirely or partially, sulfate of soda and sulfuric acid; the sulfites, bi-sulfites and sulfurous acid which are capable of being oxidized by some convenient method and of furnishing the compounds utilized in the formula indicated above.

As already stated a galvanic deposit is formed by employing the bath indicated above, and a suitable electric current or power; it is necessary to regulate the currentproportionately to the surface of the objects to be treated and to the capacity of the bath. As regards the anode, an appropriate zinc plate should be employed. 7

I claim:

1. Process for electroplating with zinc, which comprises forming a bath containing zinc sulfate, ammonium chlorid, sodium sulfate, sulfuric acid and Water, passing an elec-.

tric current through the said bath, and forming an adherent deposit of metallic zinc upon the article to be coated while such electric current is being passed through the bath.

2. Process for electroplating with zinc, which comprises forming a bath containing zinc sulfate, ammonium chlorid, sodium sulfate, sulfuric acid and water, passing an electric current through the said bath while in the cold state, and forming an adherent deposit of metallic zinc upon the article to be coated while such electric current is being passed through the bath, employing a zinc plate as anode.

3. Process for electroplatin with zinc, which comprises forming a bat containing zinc sulfate, ammonium chlorid, sodium sulfate, sulfuric acid and water in the approximate proportions of 12 kilograms sulfate of zinc, 3 kilograms ammonium chlorid, 2 kilograms sodium sulfate, 1 kilogram sulfuric acid, to 100 liters of water, passing an electric current through the said bath, and forming an adherent deposit of metallic zinc upon the article to be coated while such electric current is being passed through the bath.

4:. Process for electroplating with zinc, which comprises forming a bath containing zinc sulfate, ammonium chlorid, sodium sulfate, sulfuric acid and water in the approximate proportions of 12 kilograms zinc sulfate, 3 kilograms ammonium chlorid, 2 kilorams sodium sulfate, 1 kilogram sulfuric acid, to 100 liters of water, passing an electric current through the said bath at a temperature not exceeding 30 C., and forming an adherent deposit of metallic zinc upon the article to be coated while such electric current is being passed through the bath, employing a zinc plate as anode, substantially as described.

5. An electroplating bath containing zinc sulfate, ammonium chlorid, sodium sulfate, sulfuric acid, and water.

6. An electroplating bath containing zinc sulfate, ammonium chlorid, sodium sulfate, In Witness whereof I have hereunto set sulfuric acid, and Water, combined in the my hand in presence of tWoWitnesses.

sulfate, 3 kilograms ammonium chlorid, 2 kilograms sodium sulfate, and l kilogram Witnesses: sulfuric acid, to 100 liters of Water, substan- VICTOR PIVoRT,

tially as described. DEAN B. MAS01 I substantial proportions of 12 kilograms zinc AUGUSTE ARSENE LEMETRE Copies of this patent may be obtained for five cents each, by addressing theGommissionr of Patents, I

\ Washington, D. 0. 

